Fuse box



May 22, 1923. 1,456,385

A. T. KVARNSTROM FUSE BOX Filed July SO 1920 2 z @3&2

l//l ll /l/l/ l/ J A /yLf/YED lia/M577? 0M. SWW@ @Honing Patented May 1923.

' lUNITI-:o STATES ALFRED T. KVARNSTROM, F DETROIT, MICHIGAN. I

FUSE Box.

Application med July 30, 1920. Serial No. 400,088.

.To all lwhom it may concern:

Be it known that I, ALFRED T. KvARN- s'rnoM, citizen of the United States, residing at Detroit, county of Wayne, State of Michigan, have invented a certain new and useful Improvement in Fuse Boxes, and declare the following to be a full, clear, and exact description of the same, such as w1ll enable othersskilled in the art to which it pertains to make and use the same, reference being had to the accompanying dr-awin s, which form a part of this specification.

y invention relates to fuse boxes, the object being to provide an inexpensive, substantial fuse box capable of being assembled without lthe use of screws, bolts or other separateconnecting elements, but merely by interlocking the component parts of the wall structure of the box and which, when assembled, forms a rigid, substantial box maintaining its ri id shape by virtue of tension in one of t e wall members which tends to hold the other parts thereto.

The box as formed is constructed in sections ca able of use singly or oi being ganged or grouped together in close formation to provide a box of larger proportion, but of similar structure, component parts` held together in similar manner and serving thesame purpose.

In the drawings,-

Figure 1 is a perspective representing three sections locked together.

Fi 2 is a fragmentary sectional view showing the locking means, beingtaken on the line 2-2 of Fig. l.

Figure 3 is a fragmentary"r elevation showing means for securing the box to the wall ci a building.

Fig. 4' is a cross-section taken on 'the line 4 4 of Fig. 3.

In a switch or fuse box of this character it is not only desirable that an inexpensive article of rigid structure be produced, but also that a box be provided capable of being quickly assembled or disassembled, comosed of separate sections so that a box of linger proportion lmay be easily constructed. Ot course this box must be capable of being attached to the w-all.

My fuse box consists of independent units adapted to be used singly, or ganged together to form a multiple elongated structure as shown in Fig. 1. Each unit, when used singly, comprises a substantially U. shaped resilient meta-l section a adapted to serve as back and sides of the unit and two end sections b and c adapted to engage with section a to complete the box. It is evident that when several sections are ganged togetlier, that the end sections of the intermediate units are omitted. The side portions of this U-shaped section are provided at one end with projecting turned over ears a3, and near the other end with corresponding depressions a2.

The end section b is provided with inturned ears b2 adapted to overlap the adjacent sides of the U-shapedf section and engage in the depression a2 formed therein, as shown in Fig. 2.' End section b therefore holds the opposite sides of the U- shaped section inwardly toward each other. End section c is adapted to abut the, opposite end of the U-shaped section and be received between the inturned ears as. This end section c is of such width as to spread the side portions of the U-shaped section a apart, when it is forced into position between the ears. By virtue of the end section c exerting outward pressure on the side portions of the U-shaped section a. tending to force such side portions apart, and the end section b exerting inward pressure, tending to draw such side portions toward each other, and the resilient character of the tJ-shaped section itself, the

several sections 0f the unit are held securely together forming a rigid, substantial unitary structure, capable of withstanding any blow or shock to which it is likely to be subjected.. a

-VVlien several units are ganged, as shown in Fig. i, the ears es ci one @Ll-shaped. sec tion a engage in the corresponding pressions cr.2 in the adjacent lli-shaped sec tion 'to hold intermediate sections of the box together.

Apertures are provided through the end sections t and c to permit the passage o' electric wires therethrough, and the UJ- shaped section a is likewise provided with punch outs g for the same purpose.

A perforate tab 7b is held in position between securing ears c' in the U-shaped sections a, as shown in Figs. 3 and 4. (This tab is provided for the attachment of the box to the wall or ceiling or wherever used.

What I claim is:

1. In a fuse box, a substantially U-shaped resilient metal section adapted to serve as the back and sides 'of the box, said U- shaped strip Vprovided at one edge with projecting ill-turned ears each adapted to form a pocket for an end piece in, and provided at the other s ide With'depressions opposite and 1n line witb said ears, anend piece adapted to be recelved 1n the pocket formed by said ears on the U-shaped section so as to be held securely therein, bein forced into said pocket against the in- War tension of saidU-shaped section, an opposed end piece provided With irl-turned ears engaging said Ll-shaped section on the opposite end, the ears of said end piece ada ted to be received in the depressions in the -shaped section and adapted to be held thereon by the outward tension of the U- shaped section.

2. in article ot manufacture of tbe class described comprising three Wall sections, one a substantially 'ti-shaped section of re silient metal adapted to form the back and sides of a box provided at one end with depressions and at the other end with projecting, in-turned ears, the other sections being end pieces, one being a section adapted to be received Within the pocket formed by tbe projecting ears on tbe Ll-Shaped section so as to exert outward tension on said ldshaped section, the other end piece being provided with ears adapted to be received to be received there- Witliin .the depressions in said U-shaped section so as to exert inward tension thereon, clamping said sections securely and rigidly together to form a box.

3.' In a fuse box, in combination, a. substantially U-shaped resilient metal section adapted to form the back and sides ofthe box, each of which sides is provided at one end with an external depression and at the opposite end with a turned .over ear, an end section provided with turned over portions at opposite sides enga 'ng' in the eX- ternal depressions of the sides of the U- shaped section, and an opposed end section received betvveen the turned over ears of said sides of the til-shaped section and exerting pressure thereon to spread said sides apart.

4l. ln a fuse box, in combination, a substantially U-shaped resilient metal section orrning the baci; and sides of the loon, an end section gripping opposite sides at one end holding the same inwardly, an opposed end section positioned between said sides tbc opposite end spreadirno,` tbe saine outwardly, said ends held in piace by tbe contained tension in the @Jl-shaped section.

in testimony whereof, 'l sign this specication.

ALFRED T. KVARNS'llld-@li-. 

